The objective of this study is to determine efficacy of ritonavir-boosted lopinavir monotherapy as a maintenance regimen in HIV-1-infected patients who previously failed Non-nucleoside reverse transcriptase inhibitors (NNRTI) based regimens and currently received salvage protease-inhibitor (PI) based regimens.

TLOVR was defined as time between randomization and the last value that HIV-1 RNA <40 copies/ml in a patient who initially suppressed HIV-1 RNA but subsequently demonstrated virologic rebound (two consecutive HIV-1 RNA >40 copies/ml)

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01189695